13F Insight
DOSSIER · 13F-HR · Q2 2026

GAGNON SECURITIES LLC

$507M in tracked AUM across 83 positions as of Q2 2026.

GS
CIK 0001125725 · last filed Jun 30, 2026
Total AUM
$507M
as of Q2 2026
Holdings
83
—
positions
Whale Score
64
64
tracked
Activity
—
no data
changes this Q
AI Analysis · Q2 2026

GAGNON SECURITIES LLC filed its latest 13F-HR for Q2 2026. See the latest holdings and position changes below.

Quarter at a glance — Q2 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q2 2026.

#HoldingValueSharesWeight
01
CDNA
CAREDX INC
$50M1.8M10.0%02
WGS
GENEDX HOLDINGS CORP
$36M525K7.1%03
ENSG
ENSIGN GROUP INC
$28M174K5.5%04
AMRC
AMERESCO INC
$23M827K4.5%05
GNRC
GENERAC HLDGS INC
$21M73K4.2%06
EPD
ENTERPRISE PRODS PARTNERS L P
$19M511K3.7%07
QDEL
QUIDELORTHO CORP
$18M1.0M3.6%08
CAKE
CHEESECAKE FACTORY INC
$18M222K3.5%09
EQIX
EQUINIX INC
$17M17K3.4%10
KMX
CARMAX INC
$17M325K3.4%

Filing history

2026Q2Jun 30
$507M▲ 17.1%
83 positionsView →2026Q1Mar 31
$433M▼ 11.8%
85 positionsView →2025Q4Dec 31
$491M▼ 1.5%
86 positionsView →2025Q3Sep 30
$499M▲ 1.2%
86 positionsView →2025Q2Jun 30
$492M▲ 73.6%
87 positionsLocked2025Q1Mar 31
$284M▼ 42.9%
59 positionsLocked2024Q4Dec 31
$496M▼ 1.6%
91 positionsLocked2024Q3Sep 30
$504M▲ 13.6%
102 positionsLocked2024Q2Jun 30
$444M▲ 5.1%
97 positionsLocked2024Q1Mar 31
$423M▲ 1.4%
98 positionsLocked2023Q4Dec 31
$417M▲ 4.4%
102 positionsLocked2023Q3Sep 30
$399M▼ 17.0%
97 positionsLocked
Showing 12 of 82